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Yeah, you need all the cylinders feeding the turbo because that creates backpressure. With just one bank feeding the turbo the engine will be totally unbalanced with engine load and backpressure. That's why the Buick and GMC turbos have one side cross over to meet the other side.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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